chore(cleanup): delete unrouted legacy pages, update docs

pages/category, pages/search, pages/item-detail, pages/info/**,
pages/legal/** (40+ files) were entirely unrouted dead code:
- category/:id, category/:id/items, search all redirect/route to
  CatalogContainerComponent
- product/:id routes to ProductDetailsContainerComponent, not item-detail
- cmsContentRoutes (meant to route info/legal) is a literal empty array;
  static/legal content is served by the CMS-driven :staticPath ->
  StaticPageComponent route instead

dynamic-renderer/ is unrelated and stays - confirmed active, it's the
live homepage rendering pipeline (HomeComponent -> WebsiteRuntimeFacade
-> PageRendererService/PageResolverService -> DynamicPageLayoutComponent).

Updated docs/TODO.md, docs/KNOWN-ISSUES.md, docs/FRONTEND-ROADMAP.md,
docs/PROJECT_INDEX.md to reflect the resolution.

docs/SPRINTS.md

@@ -0,0 +1,235 @@
+# BACKEND READY
+
+Backend APIs are now available.
+
+Read
+
+docs/BACKEND-API.md
+
+Do NOT redesign.
+
+Do NOT change models.
+
+Replace ONLY gateway implementations.
+
+Keep
+
+Facades
+
+Signals
+
+Components
+
+Pages
+
+State
+
+unchanged.
+
+Implement
+
+Authentication
+
+JWT
+
+Refresh
+
+CRUD
+
+Uploads
+
+Errors
+
+Retry
+
+Offline
+
+Maintenance
+
+Feature Flags
+
+Run build.
+
+Run typecheck.
+
+Generate
+
+docs/BACKEND_INTEGRATION.md
+
+Commit.
+
+
+***************
+
+
+# RELEASE CANDIDATE
+
+Pretend this application ships tomorrow.
+
+Walk through EVERY route.
+
+Storefront
+
+Builder
+
+Backoffice
+
+Verify
+
+Console
+
+Network
+
+Performance
+
+Loading
+
+Errors
+
+404
+
+Raw i18n
+
+Icons
+
+Images
+
+Animations
+
+Overflow
+
+Responsive
+
+Dialogs
+
+Buttons
+
+Forms
+
+Search
+
+Checkout
+
+Builder
+
+Admin
+
+Fix every P0/P1 issue.
+
+Do not redesign.
+
+Commit every milestone.
+
+Generate
+
+docs/RELEASE_REPORT.md
+
+
+*****************
+
+# DOCUMENTATION SYNC
+
+Do NOT modify application code.
+
+Update only documentation.
+
+Refresh
+
+Graphify graph
+
+Obsidian
+
+PROJECT_INDEX.md
+
+FRONTEND-ROADMAP.md
+
+KNOWN-ISSUES.md
+
+ADRs if required
+
+Synchronize all project knowledge.
+
+Commit documentation separately.
+********************
+
+
+# CLEANUP
+
+Inspect only for
+
+Dead Components
+
+Dead Services
+
+Dead Routes
+
+Dead CSS
+
+Duplicate Models
+
+Duplicate Interfaces
+
+Unused Imports
+
+Unused Variables
+
+Unused Assets
+
+Unused Icons
+
+Unused SCSS
+
+Unused Directories
+
+Unused Modules
+
+Do NOT touch business logic.
+
+Produce
+
+docs/CLEANUP_REPORT.md
+
+Delete only confirmed dead code.
+
+Commit.
+
+***************
+
+
+# ANGULAR UPGRADE
+
+Inspect
+
+Angular
+
+TypeScript
+
+RxJS
+
+Builder
+
+Compiler
+
+Dependencies
+
+Determine whether upgrading to Angular 22 is safe.
+
+Do NOT upgrade automatically.
+
+Produce
+
+docs/ANGULAR22_PLAN.md
+
+Include
+
+Benefits
+
+Risks
+
+Breaking changes
+
+Migration steps
+
+Estimated effort
+
+Stop.